If u fight with 1 opps: [early game: 2 sup haste = 1 creep = 1 core | midle and late game: sup = creep, 2 creep = 1 core | supper late game: sup = creep, 2 creep = 1 hard-line-pos, 3 creep = 1 core 1/2 pos]
1 attack = 17%/18%/19%/20% (~1 sup agr)
2 attack = 31%/32%/34%/35% (~1 sup + 1 creep | 1 core)
3 attack = 43%/45%/47%/49% (~1 sup + 2 creep | 1 core + 1 creep)
4 attack = 53%/55%/57%/59% (~1 sup + 3 creep | 2 sup + 2 creep | 1 core + 2 creep | 1 sup + 1 core + 1 creep | 2 core)
5 attack = 61%/63%/65%/67% (~1 sup + creeps pack | 2 sup + 3 creep | 2 sup + 1 core + 1 creep | 1 sup + 2 core | 2 core + 1 creep)
6 attack = 67%/70%/72%/74% (~2 sup + creeps pack | 2 sup + 2 creep + 1 core | 2 sup + 2 core | 3 core)
7 attack = 73%/75%/77%/79% (~2 sup + 1 core + 3 creeps | 2 sup + 2 core + 1 creep | 3 core + 1 creep)
8 attack = 77%/80%/81%/83% (~full team | 2 sup + 2 core + 2 creep | 3 core + 2 creep)
9 attack = 81%/83%/85%/87% (~full team + 1 creep | 3 core + 3 creep)
10 attack= 85%/86%/88%/89% (~full team + 2 creep | 3 core + 4 creep)

u can use this table in following way:
duratuin 1 skill equals passive can works (2 sec = 6 passive max, 2.4 = 7/8, 2.8 = 8/9, 3.2 = 10/11) [taking into account decrease / increase in duration of negative effects]
pass works / damage deal [60/100/140/180/210]:
6 = 360 /600 /840 /1080/1260 (
7 = 420 /700 /980 /1260/1470
8 = 480 /800 /1120/1440/1680
9 = 540 /900 /1260/1620/1890
10 = 600/1000/1400/1800/2100
11 = 660/1100/1540/1980/2310

No matter how many u are hit at the same time, if passive worked, next 0,3 sec its cant work. Therefore, for a more frequent passive proc, u need to be hit a lot at the same time, and not often, but in discord a lot. However, if you are hit by a small number of enemies, its better that they hit in discord.
On avaerage, if u jump into threeenemies and a pack of creeps, the passive wont wokrs as often as u would like, and damage will be equal half of the number given in the 2 table.